Revolving device for pilger mills



Nov. 27, 1934. H. HEETKAMP 1,982,472

REVOLVING DEVICE FOR PILGER MILLS Filed Dec. 28, 1931 Patented Nov. 27,1934' UNITED STATES REVOLVING DEVICE FOR PI LGER MILLS HeinrichHeetkamp, Duisburg, Germany Application December 28, 1931, Serial No.583,526 In Germany December 27, 1930 20mins.

(Granted under the provisions of sec. 14, act of March 2, 1927; 357 0.G.

'The present invention relates to a rotating device for pilger rollingmills in which the blank is rotated in known manner while being movedforward by means of a twist bar operating in a Y '5 twist casing.

For proper operation it is'necessary that the blank during each forwardfeed movement should be rotated through a definite angle, normally anangle of 90. In order positively to attain in this rotation especiallywith different roll diameters-the roll diameter determining the travelof the blank during the feed movement-it has been usual up to. thepresent to exchange the twist-bar and the corresponding" nut throughwhich it moves. It has furthermore been pro- Posed to dispense with thetwist-bar and to dispose the sliding head in a slide channel providedwith twist grooves; on account of its complicated desig'n'thisconstruction did not find favour in actual practice. It has furthermorebeen proposed to release the twist casing-secured against rotationduring the feed movementafter the desired twist has been attained, sothat it could thus rotate freely during the forward axial movement ofthe bar; the low eiiiciency and uncertainty in operation of the deviceinpractice make it scarcely worthy of consideration.

According to the invention it is proposed to form the bar with a twistonly over a determined length which will suffice to produce the rotationdesired, the twist casing in'which the twist-bar moves being soconstructed that the surfaces of the bar engage only in line contacttherein, whereby the axial movement of the bar through the casing isrendered possible.

The twist bar is advantageously guided in the casing'by means of rollerslocated therein.

Theaccompanying diagrammatic drawing ilof the device according to theinvention.

Figure 1 is a pilger rolling mill showing the device in longitudinalsection,

Figure 2 is a sectional side elevation of the twist bar casing, on anenlarged scale.

Figure 3 is a sectional front elevation corresponding to Figure 2 takenthrough the twist bar casing.

Figure ,4 is a side elevation of the twist-bar,

lustrates by way of example: one construction prises the cylinder 2, thepiston 3 disposed therein and the piston rod 4. The piston rod 4 iscoupled at 5' to the'twist-bar 6 which-passes through the twist-barcasing 7 and is connected to the sliding head a. The sliding head'asei-ves as a carrier for the mandrel 9. The blank on the mandrel isindicated by the reference numeral 10. The twist-bar casing 7 is mountedon bearings 11 (Figure 2) so as to be rotatable and is provided in knownmanner with a ratchet toothed periphery 12. A pawl 16 is'mounted underspring pressure adjacent the casing 7 to engage with the teeth of theratchet 12 to permit rotation of the casing in one direction only. Thecasing 7 is bored to a diameter corresponding to the length of adiagonal of the twist-bard.

In the twist-bar casing 7 there are mounted rollers 13 (Figures 2 and3') which are rotatable on pins l4'and serve for guiding the twist-bar 6in its axial movements; It will be seen that 7 these rollers l3'makecontact with the surfaces of the bar 6 only along the lines 15.

The bar is according to the invention (see Figure 4) twisted only over acertain part of its length, that is to say, over the length marked 30 Xin Figure 4. The remaining part of the lengths, which is indicated bythe reference Y in the drawing, and which is connnected to the slidinghead 8 having no twist. The length' X is selected so as to give the barB'the desired twist on that section of the bar passing through the twistcasing, this length being independent of the total feed distance movedforward by the bar with the sliding head 8. As will be seen withreference to Figure 4, the total feed distance moved forwardconsequently amounts to X plus Y. Thelengths X and'Y are so selectedthat the length X is adapted to the smallest feed movement.

The operation of the device is such that during the feed movement of theblank the length Y of the bar first passes through the twist casing 7.During this part of the movement no rotation is given to the bar; thebar is rotated only after the length x enters the casing.

I I claim:-

l. A device for use. in pilger rolling mills for rotating the work inits feed movement, comprising a spindle adapted for connection to therear of the work, the said spindle being provided with guide surfacesextending in the direction of its length, the said guide surfaces beingtwisted helically for a portion of their length and being straight forthe remainder. of their length, means for advancing and retracting thespindle and the work, a iixedbearing member. a casing rotatabl'y call!for a portion of their,length and being mounted in the said bearingmember and through which the spindleextends, rollers carried by the saidcasing and adapted to engage the guide surfaces of the spindle in aplane perpendicular to the axis of the spindle, ratchet teeth formedupon the periphery of the casing, and resilient restraining meanscarried by thebearing member for engaging the said teeth. v

2. A device for use in pilger mills for rotating the work in its feedmovement, comprising a spindle adapted for connection to the rear of thework, the said spindle being provided with guide surfaces extending inthe direction of its length, the said guide surfaces twistedhellstraight for the remainder of their length, means for advancing andretracting the spindle and the work, a fixed bearing member, a casingrotatably mountedin the said bearing member and through which .thespindle extends; guiding means carried by the said casing and adapted toengage the guide surfaces of'the spindle in a plane perpendicular to theaxis of the spindle,

ratchet teeth formed upon the periphery of the casing, and resilientrestraining means carried by the bearing member for engaging the saidteeth.

HEINRICH

